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FreeBSD-SA-16:23.libarchive                                 Security Advisory
                                                          The FreeBSD Project

Topic:          Buffer overflow in libarchive(3)

Category:       contrib
Module:         libarchive
Announced:      2016-05-31
Affects:        FreeBSD 9.3
Corrected:      2016-05-21 09:27:30 UTC (stable/9, 9.3-STABLE)        
                2016-05-31 16:23:56 UTC (releng/9.3, 9.3-RELEASE-p43)
CVE Name:       CVE-2013-0211

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

I.   Background

The libarchive(3) library provides a flexible interface for reading and
writing streaming archive files such as tar and cpio, and has been the
basis for FreeBSD's implementation of the tar(1) and cpio(1) utilities
since FreeBSD 5.3.

II.  Problem Description

An integer signedness error in the archive_write_zip_data() function in
archive_write_set_format_zip.c in libarchive(2) could lead to a buffer
overflow on 64-bit machines.

III. Impact

An attacker who can provide input of their choice for creating a ZIP archive 
can cause a buffer overflow in libarchive(2) that results in a core dump or
possibly execution of arbitrary code provided by the attacker.

IV.  Workaround

No workaround is available but 32-bit systems are not vulnerable.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

Reboot is not required.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

A reboot is not required.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/SA-16:23/libarchive.patch
# fetch https://security.FreeBSD.org/patches/SA-16:23/libarchive.patch.asc
# gpg --verify libarchive.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

Restart the applicable daemons, or reboot the system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/9/                                                         r300363
releng/9.3/                                                       r301044
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0211>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:23.libarchive.asc>
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